Update add_extra_components.py

Note: 
- battery charger and battery discharger has no nice name nor plot_color
- H2 electrolysis is similar to H2 Electrolysis in the tech_color
- H2 fuel cell is similar to H2 Fuel cell in the tech_color
- H2 pipeline do have have nice name and tech_color, but the addition of it depends on the link being true in config

scripts/add_extra_components.py

@@ -120,6 +120,8 @@ def attach_stores(n, costs, elec_opts):
             capital_cost=costs.at["hydrogen storage underground", "capital_cost"],
         )
         
+        n.madd("Carrier",["H2 electrolysis","H2 fuel cell"])
+
         n.madd(
             "Link",
             h2_buses_i + " Electrolysis",
@@ -162,6 +164,8 @@ def attach_stores(n, costs, elec_opts):
             marginal_cost=costs.at["battery", "marginal_cost"],
         )
         
+        n.madd("Carrier",["battery charger","battery discharger"])
+
         n.madd(
             "Link",
             b_buses_i + " charger",
@@ -213,6 +217,8 @@ def attach_hydrogen_pipelines(n, costs, elec_opts):
     h2_links.index = h2_links.apply(lambda c: f"H2 pipeline {c.bus0}-{c.bus1}", axis=1)
 
     # add pipelines
+    n.add("Carrier","H2 pipeline")
+    
     n.madd(
         "Link",
         h2_links.index,